Category : C Source Code
Archive   : GPERF.ZIP
Filename : STDERR.C

/* Provides a useful variable-length argument error handling abstraction.

Copyright (C) 1989 Free Software Foundation, Inc.
written by Douglas C. Schmidt ([email protected])

This file is part of GNU GPERF.

GNU GPERF is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GNU GPERF is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU GPERF; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

#include
#include "stderr.h"

/* Holds the name of the currently active program. */
static char *program_name;

/* Sets name of program. */

void
set_program_name (prog_name)
char *prog_name;
{
#ifdef MS_DOS
program_name = "gperf";
#else /* real OS */
program_name = prog_name;
#endif
}

/* Valid Options (prefixed by '%', as in printf format strings) include:
'a': exit the program at this point
'c': print a character
'd': print a decimal number
'e': call the function pointed to by the corresponding argument
'f','g': print a double
'n': print the name of the program (NULL if not set in constructor or elsewhere)
'p': print out the appropriate errno value from sys_errlist
's': print out a character string
'%': print out a single percent sign, '%' */

void
report_error (va_alist)
va_dcl
{
extern int errno, sys_nerr;
extern char *sys_errlist[];
typedef void (*PTF)();
typedef char *CHARP;
va_list argp;
int abort = 0;
char *format;

va_start (argp);

for (format = va_arg (argp, char *); *format; format++)
{
if (*format != '%')
putc (*format, stderr);
else
{
switch(*++format)
{
case 'a' : abort = 1; break;
case 'c' : putc (va_arg (argp, int), stderr); break;
case 'd' : fprintf (stderr, "%d", va_arg (argp, int)); break;
case 'e' : (*va_arg (argp, PTF))(); break;
case 'f' : fprintf (stderr, "%g", va_arg (argp, double)); break;
case 'n' : fputs (program_name ? program_name : "error", stderr); break;
case 'p' :
if (errno < sys_nerr)
fprintf (stderr, "%s: %s", va_arg (argp, CHARP), sys_errlist[errno]);
else
fprintf (stderr, " %d", errno);
break;
case 's' : fputs (va_arg (argp, CHARP), stderr); break;
}
}
if (abort)
exit (1);
}
va_end (argp);
}